{"id":"CVE-2026-72409","state":"PUBLISHED","title":"net: mvneta: re-enable percpu interrupt on resume","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mvneta: re-enable percpu interrupt on resume\n\nOn Marvell MPIC platforms (Armada 370/XP/38x), mvneta uses a percpu\nIRQ disable/enable scheme for NAPI: the ISR (mvneta_percpu_isr) calls\ndisable_percpu_irq() to mask the MPIC per-CPU interrupt and schedules\nNAPI poll, which calls enable_percpu_irq() on completion to unmask.\n\nIf suspend occurs while NAPI poll is pending (between\ndisable_percpu_irq in the ISR and enable_percpu_irq in poll\ncompletion), the interrupt is never re-enabled:\n\n  1. mvneta_percpu_isr: disable_percpu_irq() + napi_schedule()\n     => MPIC masked, percpu_enabled cpumask bit cleared\n  2. NAPI poll does not complete before suspend proceeds\n     (on PREEMPT_RT this is highly likely since softirqs run in\n     ksoftirqd which gets frozen; on non-RT it can happen when\n     softirq processing is deferred to ksoftirqd)\n  3. mvneta_stop_dev => napi_disable(): cancels the pending poll\n     without executing the completion path\n  4. suspend_device_irqs => IRQCHIP_MASK_ON_SUSPEND: masks MPIC\n     (already masked, but records IRQS_SUSPENDED)\n  5. Resume: mpic_resume checks irq_percpu_is_enabled() => false\n     (bit was cleared in step 1) => skips unmask\n  6. mvneta_start_dev only restores device-level INTR_NEW_MASK,\n     does not touch the MPIC per-CPU mask\n\nResult: MPIC per-CPU interrupt stays masked permanently. The NIC\ngenerates interrupts (INTR_NEW_CAUSE != 0) but the CPU never\nreceives them, causing complete loss of network connectivity.\n\nFix by calling on_each_cpu(mvneta_percpu_enable) in the resume path\nto unconditionally unmask the MPIC per-CPU interrupt regardless of\npre-suspend state.","publishedAt":"2026-08-15T05:56:32.152Z","updatedAt":"2026-10-16T18:55:22.213Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"12bb03b436dad56692e9a103ed26156156bef5d2","status":"affected","lessThan":"bf88cd3b649bc3e638f1e8a77649581852747a68","versionType":"git"},{"version":"12bb03b436dad56692e9a103ed26156156bef5d2","status":"affected","lessThan":"8c7a489aa71d2693752b2e794a68bf672d16c829","versionType":"git"},{"version":"12bb03b436dad56692e9a103ed26156156bef5d2","status":"affected","lessThan":"82c13027ed283b856017adee970dbfdffce5c6b8","versionType":"git"},{"version":"12bb03b436dad56692e9a103ed26156156bef5d2","status":"affected","lessThan":"be626ac1faadd49c2cead9f9cd06ba8752d81563","versionType":"git"},{"version":"12bb03b436dad56692e9a103ed26156156bef5d2","status":"affected","lessThan":"1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6","versionType":"git"},{"version":"12bb03b436dad56692e9a103ed26156156bef5d2","status":"affected","lessThan":"b84dd48f9da1eb132bdc06a944423cd5a1641ef1","versionType":"git"},{"version":"12bb03b436dad56692e9a103ed26156156bef5d2","status":"affected","lessThan":"5bdb33ff6e58bdc43632e98b30723eb65352d671","versionType":"git"},{"version":"12bb03b436dad56692e9a103ed26156156bef5d2","status":"affected","lessThan":"fd398d6480987e4c84fff0aaab6b9d6642a93343","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/marvell/mvneta.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.4","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/marvell/mvneta.c"]}],"references":["https://git.kernel.org/stable/c/bf88cd3b649bc3e638f1e8a77649581852747a68","https://git.kernel.org/stable/c/8c7a489aa71d2693752b2e794a68bf672d16c829","https://git.kernel.org/stable/c/82c13027ed283b856017adee970dbfdffce5c6b8","https://git.kernel.org/stable/c/be626ac1faadd49c2cead9f9cd06ba8752d81563","https://git.kernel.org/stable/c/1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6","https://git.kernel.org/stable/c/b84dd48f9da1eb132bdc06a944423cd5a1641ef1","https://git.kernel.org/stable/c/5bdb33ff6e58bdc43632e98b30723eb65352d671","https://git.kernel.org/stable/c/fd398d6480987e4c84fff0aaab6b9d6642a93343"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72409.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72409","state":"PUBLISHED","datePublished":"2026-08-15T05:56:32.152Z","dateUpdated":"2026-10-16T18:55:22.213Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.926Z"},"containers":{"cna":{"title":"net: mvneta: re-enable percpu interrupt on resume","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mvneta: re-enable percpu interrupt on resume\n\nOn Marvell MPIC platforms (Armada 370/XP/38x), mvneta uses a percpu\nIRQ disable/enable scheme for NAPI: the ISR (mvneta_percpu_isr) calls\ndisable_percpu_irq() to mask the MPIC per-CPU interrupt and schedules\nNAPI poll, which calls enable_percpu_irq() on completion to unmask.\n\nIf suspend occurs while NAPI poll is pending (between\ndisable_percpu_irq in the ISR and enable_percpu_irq in poll\ncompletion), the interrupt is never re-enabled:\n\n  1. mvneta_percpu_isr: disable_percpu_irq() + napi_schedule()\n     => MPIC masked, percpu_enabled cpumask bit cleared\n  2. NAPI poll does not complete before suspend proceeds\n     (on PREEMPT_RT this is highly likely since softirqs run in\n     ksoftirqd which gets frozen; on non-RT it can happen when\n     softirq processing is deferred to ksoftirqd)\n  3. mvneta_stop_dev => napi_disable(): cancels the pending poll\n     without executing the completion path\n  4. suspend_device_irqs => IRQCHIP_MASK_ON_SUSPEND: masks MPIC\n     (already masked, but records IRQS_SUSPENDED)\n  5. Resume: mpic_resume checks irq_percpu_is_enabled() => false\n     (bit was cleared in step 1) => skips unmask\n  6. mvneta_start_dev only restores device-level INTR_NEW_MASK,\n     does not touch the MPIC per-CPU mask\n\nResult: MPIC per-CPU interrupt stays masked permanently. The NIC\ngenerates interrupts (INTR_NEW_CAUSE != 0) but the CPU never\nreceives them, causing complete loss of network connectivity.\n\nFix by calling on_each_cpu(mvneta_percpu_enable) in the resume path\nto unconditionally unmask the MPIC per-CPU interrupt regardless of\npre-suspend state."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"12bb03b436dad56692e9a103ed26156156bef5d2","status":"affected","lessThan":"bf88cd3b649bc3e638f1e8a77649581852747a68","versionType":"git"},{"version":"12bb03b436dad56692e9a103ed26156156bef5d2","status":"affected","lessThan":"8c7a489aa71d2693752b2e794a68bf672d16c829","versionType":"git"},{"version":"12bb03b436dad56692e9a103ed26156156bef5d2","status":"affected","lessThan":"82c13027ed283b856017adee970dbfdffce5c6b8","versionType":"git"},{"version":"12bb03b436dad56692e9a103ed26156156bef5d2","status":"affected","lessThan":"be626ac1faadd49c2cead9f9cd06ba8752d81563","versionType":"git"},{"version":"12bb03b436dad56692e9a103ed26156156bef5d2","status":"affected","lessThan":"1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6","versionType":"git"},{"version":"12bb03b436dad56692e9a103ed26156156bef5d2","status":"affected","lessThan":"b84dd48f9da1eb132bdc06a944423cd5a1641ef1","versionType":"git"},{"version":"12bb03b436dad56692e9a103ed26156156bef5d2","status":"affected","lessThan":"5bdb33ff6e58bdc43632e98b30723eb65352d671","versionType":"git"},{"version":"12bb03b436dad56692e9a103ed26156156bef5d2","status":"affected","lessThan":"fd398d6480987e4c84fff0aaab6b9d6642a93343","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/marvell/mvneta.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.4","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/marvell/mvneta.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/bf88cd3b649bc3e638f1e8a77649581852747a68"},{"url":"https://git.kernel.org/stable/c/8c7a489aa71d2693752b2e794a68bf672d16c829"},{"url":"https://git.kernel.org/stable/c/82c13027ed283b856017adee970dbfdffce5c6b8"},{"url":"https://git.kernel.org/stable/c/be626ac1faadd49c2cead9f9cd06ba8752d81563"},{"url":"https://git.kernel.org/stable/c/1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6"},{"url":"https://git.kernel.org/stable/c/b84dd48f9da1eb132bdc06a944423cd5a1641ef1"},{"url":"https://git.kernel.org/stable/c/5bdb33ff6e58bdc43632e98b30723eb65352d671"},{"url":"https://git.kernel.org/stable/c/fd398d6480987e4c84fff0aaab6b9d6642a93343"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - Remote traffic on internet-facing Marvell Armada 370/XP/38x routers, NAS, and gateways drives mvneta_percpu_isr/NAPI (race step 1); the highest-impact scenario pairs sustained RX/TX load with automatic suspend/resume, so the attack is initiated from the network.\nAC:L - On PREEMPT_RT (called highly likely in the fix) or when softirq is deferred to ksoftirqd, an attacker can sustain traffic to keep NAPI pending across suspend; no uncontrollable memory layout or rare one-shot victim state is required beyond routine PM cycles.\nPR:N - Sending packets to the mvneta interface requires no credentials; in the strongest scenario suspend/resume is driven by automatic system power management rather than privileged manual action, so no account or capability on the victim is needed.\nUI:N - No victim user action is required beyond normal operation; remote traffic and automatic suspend/resume (or scheduled PM) suffice without anyone mounting devices or confirming prompts.\nS:U - The bug leaves the MPIC per-CPU IRQ permanently masked on the same host kernel/driver boundary; it does not cross VM, container, or IOMMU security domains.\nC:N - This is a driver/IRQ state-management logic error with no out-of-bounds access, use-after-free, or memory disclosure; interrupts stay masked but no kernel memory is read.\nI:N - No data structures or packets are corrupted; the failure mode is a permanently masked interrupt with no write primitive or control-flow hijack potential.\nA:H - After resume the MPIC per-CPU interrupt remains permanently masked, so the NIC never delivers packets despite hardware activity, causing complete and lasting loss of network connectivity until reboot."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:43:49.648Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-72409","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-16T18:49:13.017025Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T18:55:22.213Z"}}]}}}